At the biological level, we don't know exactly what happened. Good research requires testing subjects and this is difficult for things that are spontaneous. Some theories have been created from our work. They all have to do with memory, how we keep it and how we get it. This is a large and complex research area, so in a few years everything can be different.
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The first theory is that the neurons are misfiring in the regions that connect the time to an event. In this scenario, we are a new memory to provide this stance, but our brain makes a mistake that makes us feel earlier. You mark the gift as past; The brain is confused because there is an earlier time code of what you see right now. This leads to an emotion that was previously known, right?
The second theory is similar to the first one, but has nothing to do with different nerve pathways that gives the couple information. In this scenario, there is an old memory space (but a color or smell) of the media that is not completely receiving. A little bit like a word at the end of your tongue, you know what it is, but the word is not there for a while. A word instead of a souvenir, a sense of fame.
At the same time, it is being processed now, you are still going through the new city. This is the place that goes wrong, the familiarities of the old memory, the things you see at that moment, the past and present mix, and stand there and become déjà-vu.
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It looks like a memory event. A mismatch between what we know and what we're experiencing right now. There's nothing to worry about, and all of us (and if you have epilepsy then you'd know).
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